LU-VE ALFA ptigo PF27MC User manual

ORIGINAL INSTRUCTIONS
31573808EN-02
Optigo PF27MC
Instruction manual
• Product description
• Product labels
• Unpacking & lifting
• Installation
• Maintenance
• Spare parts

31573808EN-02
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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
Index
1. Important information ............................................................................................................ 3
1.1 Disclaimer ................................................................................................................................. 3
1.2 Intended use ............................................................................................................................. 3
1.3 Where to nd product information ............................................................................................ 3
1.4 Warning symbols ...................................................................................................................... 3
1.5 Health, safety and hygiene ....................................................................................................... 4
1.6 Use of ammable gas ............................................................................................................... 4
1.7 Checks at delivery .................................................................................................................... 5
1.8 Return of unused heat exchangers .......................................................................................... 5
1.9 Guarantee ................................................................................................................................ 5
1.10 Disposal .................................................................................................................................... 5
2. Product description ............................................................................................................... 6
2.1 General information and application ......................................................................................... 6
2.2 Standard conguration ............................................................................................................. 6
2.3 Options ..................................................................................................................................... 6
2.4 Code description ...................................................................................................................... 6
3. Product labels ......................................................................................................................... 7
4. Transport and storage ........................................................................................................... 8
5. Unpacking and lifting ............................................................................................................. 9
6. Installation ............................................................................................................................ 11
6.1 Mounting dimensions ............................................................................................................. 11
6.2 Mounting bracket .................................................................................................................... 12
6.3 Technical spaces .................................................................................................................... 12
6.4 Refrigerant connections ......................................................................................................... 13
6.5 Cooler capacity check ............................................................................................................ 14
6.6 Drain line ................................................................................................................................ 14
6.7 Electrical connections ............................................................................................................. 15
6.8 Power failure .......................................................................................................................... 15
6.9 Fan motors connections ......................................................................................................... 16
6.10 Defrost .................................................................................................................................... 16
7. Maintenance .......................................................................................................................... 18
7.1 Shut down periods .................................................................................................................. 18
7.2 Moisture in the refrigeration system ....................................................................................... 18
7.3 Cleaning and disinfecting ....................................................................................................... 18
7.4 Casing .................................................................................................................................... 18
7.5 Coil and drip tray .................................................................................................................... 18
7.6 Electric defrost elements replacement ................................................................................... 19
7.7 Driptray heater elements replacement ................................................................................... 20
7.8 Fans replacement ................................................................................................................... 21
8. Residual risks ....................................................................................................................... 22
9. Troubleshooting ................................................................................................................... 22
10. Spare parts ............................................................................................................................ 23

31573808EN-02
3
Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
1 Important information
1.1 Disclaimer
This Instruction Manual applies to all Optigo PF27MC air cooler products. Manual must be carefully
examined and instructions should be followed up at all times.
Alfa LU-VE does not accept liability for any damage resulting from non-compliance to the
instructions as given in the manuals and order-related documents.
1.2 Intended use
Air coolers are partly completed machinery according to Machine Directive 2006/42/EC and are
intended for incorporation in cooling systems. Declarations of Incorporation are available on
alfa.luvegroup.com. The product is built according to the following standards:
• PED 2014/68/EU
• Safety of Machinery EN 60204-1
• Directive 2014/30/EC and subsequent modifications. Electromagnetic compatibility.
• Low Voltage - Reference Directive 2014/35/EC
However it is forbidden to operate our equipment before the machine incorporating the products or
making part thereof has been declared to be in conformity with the EC Machine Directive.
1.3 Where to find product information
Detailed technical data for individual product models are available in order related documents,
on the product label and in product data sheets. Comprehensive technical information for all
Alfa LU-VE air heat exchanger products is available on-line on alfa.luvegroup.com. This includes:
• Product manuals
• Instruction manuals
• Product leaflets & brochures
• Product data sheets (selection software)
• Dimensional drawings
• Certificates
Alfa LU-VE offers world-wide service and support. In case of any questions
or uncertainty please contact your local Alfa LU-VE representative.
Contact addresses are available at alfa.luvegroup.com.
1.4 Warning symbols
The following warning symbols are used in Alfa LU-VE instruction manuals.
General warning.
Risk of malfunctioning and/or
damage.
Hot surfaces. Danger of burns.
Wear adequate protection.
Moving parts. Danger of injuries.
Do not operate without protection guard mounted.
Sharp surface. Danger of cutting injuries. Wear
adequate protection.
Overhead load.
Never stand or walk below the load.
Mandatory prescription.
Follow instructions as provided.
Forklift trucks or other logistic vehicles.
Stay clear of working space.
Risk of injuries.
Wear head protection.
Electrically powered component. Switch off power
supply before any maintenance or installation
activity.
Risk of injuries.
Wear safety footwear.
alfa.luvegroup.com/pfmc

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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
Cold parts. Danger of frostbite injuries.
Wear adequate protection.
Risk of injuries.
Wear protective gloves.
A3 flammable gas.
1.5 Health, safety and hygiene
Ensure that the following guidelines are observed:
• All work on the equipment must be carried out by trained personnel.
• The electrical supply is suitable for the equipment supplied.
• Refrigerant, temperature and pressure must agree with the data on the product label of the
relevant heat exchanger.
• As the heat exchanger is supplied indirectly, the producer is not acquainted with its actual
application.
• The heat exchanger should be installed in conformance with the recognized national standards
of electrical and refrigeration installation practice.
• The supplied heat exchanger is optimized for the refrigerants as stated in the data sheet or
order documents. The allowed maximum pressure is noted on the type plate. During production
the heat exchanger was subjected to a strength test exceeding the design pressure. However,
during normal use the design pressure may not be exceeded.
• Heat exchangers supplied by Alfa LU-VE are normally not equipped with a high-pressure cut
out. The installer is responsible for fitting a high-pressure cut out on the system in which the
heat exchanger is used.
• The heat exchanger shall not be blocked in. If the ambient temperature rises, the pressure could
rise and exceed the design pressure.
• It is not permitted to use the heat exchanger for any purpose other than the one it was designed
for by Alfa LU-VE.
• If the equipment is used in the food industry, responsibility with regard to hygienic conditions lies
with the end user.
1.6 Use of flammable gas
• The product must be stored and installed in rooms where the use of open flames or other
ignition sources is forbidden
• During transport, handling, installation, the product and, in particular, the pipes must be
protected to avoid physical damage which may cause it breakage.
• In the event of suspicious damages or doubts about the correct handling (eg. damaged
packaging) do not install the product before carrying out a thorough integrity check.
• Install the product only and exclusively in places that comply with the minimum size and/or air
exchange requirements established by the applicable standards, in relation to the total charge of
flammable fluid provided for in the installation in which it is incorporated.
• All ordinary and extraordinary maintenance operations must be performed only by qualified
personnel in the use of equipment with flammable fluid. special attention to operations that
require interventions on the pipes.
• The use of refrigerants different than those indicated in the data plate or in this manual is
forbidden.
In general, the use of refrigerants that are not included in the list of the IEC 60335-2-40 Annex b
standard is forbidden.
• Before performing any maintenance operation, exclusively by qualified staff, perform a check for
the absence of gas in the room and around the product through an appropriate detector.
• Before performing any operation for opening the pipes of the refrigerant circuit, by means of
mechanical operations or with open flames, make sure that the circuit does not have any
quantity, even minimal, of inflammable gas and that it has been washed internally with inert
gas (ex. nitrogen). all operations must be performed by personnel qualified in the use of
flammable gases.
• The product shall not be modified in any part of it, by removing or adding component.s

31573808EN-02
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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
• The product is not an Atex product. The connection of any system component that is not already
assembled in the factory, must take place outside the product, at an appropriate distance and
check that its installation complies with all the regulatory requirements applicable to flammable
gas systems.
• The product is not an Atex product. It is the responsibility of the installer to verify the compliance
of the product and its incorporation in the system to european and national standards.
• In the case of components that must necessarily be installed inside the product, the compliance
of the final assembly is the responsibility of the installer. in particular:
- the use of any component, electrical or mechanical, which may be the origin of sparks or
flames, is forbidden. Only the exclusive use of components suitable for use in explosive
atmosphere (Atex) is allowed.
- the use of components that may be cause of flammable gas leaks is forbidden.
The installation of components of the refrigerant circuit is allowed only with permanent brazed
connection.
1.7 Checks at delivery
At the moment of delivery, carefully check the units.
All finned coils are pressure tested with dry air, sealed and supplied with a slight overpressure. Prior
to installation, the leak resistance must be checked with the Schrader valve.
Any present damage must be reported on the delivery note with a description of the damage.
Damaged heat exchangers, including when the damage is not externally visible, are to be reported
to the shipping agent and Alfa LU-VE within 24 hours.
1.8 Return of unused heat exchangers
Air heat exchangers that have been delivered in accordance with orders are in principle not
returnable. Heat exchangers can only be returned under certain conditions and following
consultation with Alfa LU-VE. This applies exclusively to unused units. The heat exchangers that
are to be returned should be delivered carriage paid to Alfa LU-VE in the original, undamaged and
unwritten factory packaging. Not returnable are:
• Heat exchangers older than three months from the invoice date.
• Heat exchangers that have already been built in and/or are damaged.
1.9 Guarantee
For our guarantee conditions, we refer to the Terms of Delivery. In general, the warranty period
between Alfa LU-VE and the customer is 24 months from factory invoice date or 12 months of
operation, which ever comes first. Heat exchangers must not be returned or disposed of, other
than in accordance with instructions from Alfa LU-VE. Contact your local Alfa LU-VE representative
before any remedial action is taken on the units, otherwise warranty may be void.
1.10 Disposal
After decommissioning the heat exchanger coil should be emptied from refrigerant fluids. Avoid
any emissions in the environment. Any refrigerants and oil residuals must be properly disposed of
according to applicable environmental regulations. The fully emptied heat exchanger unit, including
all electrical components, should be handed in to the proper authorized companies for recycling.

31573808EN-02
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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
2 Product description
2.1 General information and application
Optigo PF27MC are cubic commercial air coolers suitable for the safe use of A3 refrigerants such
as R290 (propane). General application for Optigo PF27MC are in small to medium-sized cooling
rooms.
• Refrigerants: HFC A1, A2L, A3
• Design pressure: 24 bar
• Capacity (SC2 with R404): 1.07 up to 6.9 kW
• Capacity (Tair = 2.5 °C, Tevap = - 7.5 °C with R290): 1.40 up to 9.01 kW
• Air flow: 900 up to 10,400 m³/h
• Min. room temperature: - 25 °C
2.2 Standard configuration
• High-efficiency coil manufactured from internally grooved Cu tubes and louvered aluminium fins.
• Standard fin spacings: 4.5, 6 and 7 mm.
• Optigo PF27MC coolers are available with 1 to 4 fans fitted with high efficiency single speed Ø
275 mm EC fan motors drawing through the coil. Power supply 230/50/1. Fan motors are wired
to a central connection box.
• Durable galvanized steel casing, powder coated RAL 9003. Dismountable and openable casing
for cleaning and inspecting purposes.
• Each heat exchanger is leak tested with dry air and finally supplied with a dry air pre-charge.
• Delivered on a wooden pallet covered with a reinforced cardboard box.
2.3 Options
• Driptray heater (HD)
• Electric defrost in coil + driptray heater (E+HD) - only for 7 mm n spacing models
• Coil protection: Alupaint (AP)
• Driptray insulation (IS)
2.4 Code description
PF27MC - 2 1 - 4 N AL BP - *
1 2 3 4 5 6 7 8
1 Optigo PF27MC A3 safety compliant cubic commercial unit coolers (Ø 275 mm)
2 Number of fans (1 to 4)
3 Coil type (1, 2)
4 Fin spacing (4=4.5, 6=6.0, 7=7.0)
5 Defrost system (N=air defrost, HD=driptray heater, E+HD=electrical defrost in coil+driptray
heater)
6 Fin material (AL=aluminium, AP=pre-painted aluminium)
7 Packing (BP=box+pallet)
8 Options

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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
①
③
④
②
1. Flammable gas
Use of flammable gas.
⑤
3 Product labels
Manufactured by
SEST-LUVE-POLSKA sp. z. o. o.
ul. Wyczólkowskiego 30,
44-109 Gliwice, Poland
HEAT EXCHANGER
PF27MC-21-4 N ALBP-
CODE: 10232606
S/N: 7487840/2021
PED CAT I
Fluid: A3
VOLUME: 6.00
dm3
Ts: -40 °C +55 °C
Max Pres: 2.4 MPa
VENTILATION
Nr. Motors: 2
PowerS: 230 V 50 Hz
180 W 0.8 A
N°
N°
MADE IN
POLAND
DEFROSTING
EXAMPLE
EXAMPLE
2. Product label
This label is positioned inside the casing.
Model Refer to paragraph "2.4
Code description"
Product code
Product Serial nr.
Communicate these when
ordering spare parts as
they identify the unit
PED Category According to PED
Fluid Refrigerant
Volume Coil Volume
Ts Range of operating
temperatures for the coil
Max Pres Max working pressure
No Motors Number of fans
Product code
Product serial nr.
Fluid
Volume
Ts
Max Pres
No. Motors
PED category
Model
⑥

31573808EN-02
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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
3. Precharge warning
Units are delivered from the manufacturer
with an overpressure. Check pressure on the
Schrader valve. With unpressurised unit:
immediate report to manufacturer and note on
bill of delivery.
When installing the unit ensure the Schrader
valve is removed.
4. Electrical warning
Electrically powered component. Switch off
power supply before any maintenance or
installation activity.
5. Refer to instruction manual
Manual must be carefully examined and
instructions should be followed up at all times.
4 Transport and storage
During transportation the heat exchanger must be handled with all required care. Any instruction or
warning signs attached to the heat exchanger or the packaging must be followed. Avoid shocks or
continuous vibrations during transport. These may cause damage to the product. If required, consult
Alfa LU-VE and disassemble during transport any parts that are likely to be set into vibration. Air
heat exchangers must be adequately fixed on the transport vehicle. If temporary storage of the heat
exchanger is required, the following points should be observed:
• Store the heat exchanger in its packing, in a dry place with sufficient protection against sun and
other environmental influences.
• Always place air heat exchangers on an even surface.
• Do not stack air heat exchangers unless explicitly indicated this is allowed.
• Storage temperature between -40° C and +50 °C.
• Never open or remove the Schrader valves before unit installation. Overpressure in the coil must
be maintained.
Shelf life of air coolers is one year. If longer storage periods occur, check:
• Proper functioning of the fan motor.
• Mounting brackets, lifting lugs and fan fixings for corrosion.
6. Eurovent
The Optigo PF27MC series machines use
the same heat exchange components as the
corresponding Optigo FMC series models and
provide the same performance. The Optigo
PF27MC series machines can work with HFC
category A1 refrigerants.

31573808EN-02
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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
Place the unit on the ground and manually turn
the air cooler into mounting position on a second
wooden pallet. Keep the packaging material in
place to prevent the drip trays from damaging.
Remove the cardboard box.
Unscrew the fixings from the original support
pallet (now on top) and remove it.
The cooler is now in mounting position.
PF27MC models are delivered on a wooden pallet covered with a reinforced cardboard box.
Handling and positioning can take place manually (smaller models) or with use of a forklift.
5 Unpacking and lifting
In order to avoid damage to the air cooler or
falling of the unit, ensure that the lifting forks
cover all beams from the lower support pallet.
Packed air coolers may be stacked during
transportation (max. 2) and storage (max. 3).
Respect the maximum number of stacked air
cooler units.
max. 3
max. 2
>50 mm

31573808EN-02
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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
Lift the unit to mounting position and secure
following instructions given in chapter "6
Installation".
After having secured the cooler, the forks
may be lowered and the remaining packaging
materials can be removed.
Ensure that the cooler is not lifted directly onto the drip tray or the finned coil. Utilizing the proper
wooden transport beams and/or pallets prevents the cooler bending at the extremes such that the
cooling circuit or other components are damaged. All lifting procedures must be carefully carried out
by properly qualified personnel, ensuring absolute safety at all times.

31573808EN-02
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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
Model n. of fans
Dimensions (mm)
A B
PF27MC 1 678 412
PF27MC 2 1048 782
PF27MC 3 1418 1152
PF27MC 4 1788 1522
6 Installation
6.1 Mounting dimensions
3/4'' GAS
20
10
363
415
B
A
Coolers must be hung such that the coolers can contract and expand somewhat. Cooler contraction
occurs during refrigeration operation, and cooler expansion occurs during defrost. For air coolers
with copper tubing this figure runs up to 1.65 mm per meter cooler length. All heat exchangers must
be set up level.
Do not install in a location:
• too close to heat sources.
• that may increase the vibration of the unit.
• that cannot support the weight of the unit.
• subject to risk of exposure to combustible gas.
• exposed to oils and vapours.
• with unusual environmental conditions.
Choose a location:
• where the noise and exhaust air are within the limits permitted by applicable standards and
regulations.
• protected from headwinds.
• with the required space.
• that will not block passageways or doors.
• with a floor structure that is strong enough to support the weight of the
unit and minimize vibration transmission.
Weight information are listed on the product label and/or in the relevant
product documentation.
Detailed drawings showing all required mounting and refrigerant connection
dimensions are available available for download on alfa.luvegroup.com.
Dimensional drawings
298
15
33
330

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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
6.2 Mounting bracket
Use suitable studs when mounting the unit to the
ceiling.
Fix the unit to cold room ceiling by securely
tightening nuts and washers.
6.3 Technical spaces
Heat exchangers should be positioned such that the following criteria are met:
• Adequate space must be left on the air inlet side of the heat exchanger. The air discharge side
should be free of restrictions. Recirculation of air is to be avoided.
• The heat exchangers should not be connected to ducting on either the air inlet side or discharge
side, unless the heat exchanger has been specifically designed for such an application.
It is important to remember that the total amount of heat to be dissipated depends on receiving
the full design air volume at the design entry air temperature which allows this air to be freely
discharged after passing through the heat exchanger. Any restrictions may impair the performance
of the cooler. If in doubt, please check with Alfa LU-VE.
Respect the minimum wall distance on suction
side.
Respect the minimum space for electric defrost
extraction and replacement.
Ø 10 mm
500 mm
min. A A
E

31573808EN-02
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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
6.4 Refrigerant connections
All pipework and connections must be made in accordance with good refrigeration design and
installation practice.
Before performing the connection, ensure that no flammable gas is present in the system and in the
product.
Ensure that no stresses are transmitted to the pipework. All pipework should be adequately
attached to the walls/ceilings of the cold room and not only to the cooler itself. Pipework must be
adequately supported to prevent vibration or external load on the cooler headers, etc.
Components that may cause gas leaks (for example pressure points) must not be installed inside
the product. All refrigeration connections must be made by brazing.
Do not adapt headers position to the suction line.
Ensure the supply circuit is closed (no pressure)
before connecting the suction lines.
Open side covers.
Connect the suction line line (L).
Ensure the flame nozzle is not aimed at the
equipment, when welding.
L
L
LL

31573808EN-02
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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
6.5 Cooler capacity check
Ts'=cold room air inlet temperature.
Te=evaporating temperature. It is related to the
refrigerant pressure on the unit cooler outlet.
Trs=refrigerant superheat temperature, on
suction line near thermostatic valve bulb.
(Trs-Te)=superheat
(Trs-Te) ≤ 0.7 x (Ts'-Te)
Keep the superheat as low as possible to obtain
maximum unit cooler performance.
The thermostatic valve fitted must be correctly
sized for the installation conditions and adjusted
for correct system operation.
Connect the drain tubing (F) to the drain
connection (G).
All pipework should be adequately attached to
the walls/ceilings of the cold room and not only
to the cooler itself.
6.6 Drain line
Check all drain lines and driptray to ensure that no improper material such as, e.g., packaging
material blocks the drain.
Tighten drain connection by hand only.
The drain line diameter must be at least the size
of the driptray drain diameter and should be laid
with an adequate slope. For room temperatures
below 0 °C drain line insulation and defrosting
are required.
A syphon must be installed on the drain line,
outside the cold room.
L
G
F
60°
TeTs' Trs
≥ 1.5 m

31573808EN-02
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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
6.7 Electrical connections
All electrical connections must be made in accordance with the locally valid regulations and in
conformance with good installation practice. The site supply voltage, frequency, accepted power
rating and number of phases must comply with the details on the technical documentation. All
electrical supply lines must be connected to the terminal boxes through suitable waterproof glands
using bottom entry or, in case of horizontal installation, the cable is routed to form a water trap.
If the heat exchangers are installed and there is to be an appreciable delay in putting the plant into
operation, a temporary electrical supply should be connected to each motor, sufficient to run for
at least 4 hours. This procedure should be carried out at least once every 4 weeks, until the heat
exchanger is fully operational. It is up to the end user to verify the conditions for protection by
automatic disconnection of supply, according to applicable standards. Heat exchangers are
designed for TN power systems. The insulation fault protection must be part of power supply of the
heat exchanger and is not supplied by the manufacturer.
The following data determine which connection diagram is to be selected and respected for
electrical installation:
• Heat exchanger model indication
• Fan motor type
• Electrical options
When in doubt always contact your local supplier or Alfa LU-VE representative for assistance.
Ensure complete electrical isolation before performing any wiring.
In accordance with the current legislation,
install a single pole terminal in a visible position
between the unit and the power supply. Opening
between terminals 3 mm at min.
Remove the terminal block cover (M).
Insert the cables into the grommet (N) and
block them with their respective gland. Connect
terminals by following the wiring diagrams on the
cover. When all connections are made refit the
terminal block cover.
For systems using electrical defrost, a defrost
termination thermostat should be used, having a
range of 10 °C to 20 °C with a sensor attached
to the top return bends of the coil block or buried
in the top of the coil block fins (J).
motors
heaters
M
motors
M
heaters
P
P
N
J
Use only Atex certified thermostat, for use in explosive atmosphere.
Any electrical component not supplied with the appliance must be installed outside the unit.
6.8 Power failure
In order to avoid damage to the compressor, the refrigerant supply must be closed in the event of
power failure, e.g. by closing the magnetic valve. Safety measures elsewhere in the system will
prevent the pressure in the heat exchanger from exceeding the design pressure.

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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
6.9 Fan motors connections
The maximum load of the motors and the recommended settings for the overload relays are to be
respected. The built-in thermal overload protection must be integrated in the control circuit when
a connection in the terminal box is present. The electrical control circuit should be arranged with
a manual reset device in order to prevent continuous on/off switching (tripping) of the motors.
Suppliers and manufacturers of electrical motors provide no guarantee for motors that are
combusted through overload.
Ensure complete electrical isolation before performing any wiring.
1~230 V 50-60 Hz
Type Power supply Ø
Motor power consumption*
n. of fans
1 2 3 4
EC 1~230 V - 50/60 Hz 275 28 W 0.2 A 56 W 0.4 A 84 W 0.6 A 112 W 0.8 A
* During operation with frost on the fins, the electrical absorption can grow up to 20-30 % more than the nameplate data.
6.10 Defrost
Always refer to the electrical scheme for both connections and nominal voltage of the electrical
defrost option. Earth cable must always be wired and connected to the appropriate terminal in the
connection box. Always refer to the electrical scheme order to identify the ground terminal.
Warning about the neutral wire: it must be connected if indicated in the electrical scheme. It must
not be connected if it is not shown in the electrical scheme.
Coolers without defrosting facilities may not be used in room temperatures below +2 °C.
If the cooler is working on a time termination cycle, it is suggested that an initial defrost period be
set at 35 to 45 minutes (in combination with the number of defrost periods). This setting is to be
refined through trial and error, according to the actual defrost requirements depending on cooler
model, size, and working conditions. If the defrosting cycle is terminated via a temperature sensor,
close attention must be taken in positioning the thermostat sensor. The temperature sensor is
usually set at a value between 10°C and 15°C. In general it should be positioned where the last
traces of frost disappear, usually on the coil.
At room temperatures of around 0°C the last frost is usually in the top of the coil block. At room
temperatures below -20°C, this is the consequence of the so-called 'chimney effect', usually in the
lower half of the coil block at approx. ¼ of the fin height. Unfortunately a number of factors (cooler
position relative to an access door or stored products, precise setting of the thermostatic expansion
valve, etc.) may cause identical coolers to perform differently. Thermostat sensors should NOT be
placed in the direct vicinity of a heater element. The final position of the temperature sensors must
be determined through trial and error.
L N PE PE N L L N PE PE N L L N PE PE N L L N PE PE N L
STANDARD

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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
Ensure complete electrical isolation before performing any wiring.
n. of fans
Electric defrost in coil and driptray heater*
E E E+HD
n. W (x1) W (tot) W (tot)
1 4 250 1000 1200
2 4 450 1800 2150
3 4 650 2600 3080
4 4 800 3200 3850
* available only for 7 mm fin spacing units
n. of fans
Driptray heater HD
n. W
1 1 200
2 1 350
3 1 480
4 1 650
3~+N 400V 50-60Hz
E
E E E E
HD
HD
STANDARD
N
L3 L2
L1
PEL3L2L1 N N
PE

31573808EN-02
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Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
7 Maintenance
It is essential after delivery that adequate protection and inspection are carried out on the
equipment. This is especially important if there is any delay in installing or commissioning the
equipment. After commissioning and setting up the defrost systems, the heat exchanger will require
maintenance. Regular checks and good maintenance will ensure trouble free operation. The
frequency of checks will depend on site location and the specific operating conditions. Equipment
installed in industrial or coastal areas, or in any kind of aggressive environment, generally requires
more frequent inspections than the same equipment in rural, unpolluted areas. Damage can occur
during site installation and during the period prior to commissioning. Inspections and remedial
work should take place during this period. On sites where building work is in progress, it is strongly
advised that finned block, headers and return bends are covered up to keep them clean and
protected from damage until the time of commissioning.
Header and cooler tubes can be extremely cold! Take precautions when maintenance is carried out
near the header and cooler tubes.
Ensure complete electrical isolation before performing any maintenance activity.
7.1 Shut down periods
Even during prolonged shut down periods, maintenance should be carried out. If the shut down
period is extended, all electric motors should be run once every four weeks for a minimum of 4
hours. EC fans must be kept powered during shut down periods.
7.2 Moisture in the refrigeration system
Moisture in a refrigeration system is undesirable. Moisture can cause malfunctioning in the
refrigeration operation. A lesser known problem is that small amounts of moisture in the refrigeration
system can after a time cause leakage through the formation of frost clumps. These frost clumps
are the result of moisture seeping from the refrigeration system during defrost, as water seeps into
the soldering seams and then freezes, resulting in a volume increase. This process repeats itself
during each freeze/defrost cycle, as a result of which the cavities (potholes) thus formed become
steadily larger and ultimately burst, causing leakage.
7.3 Cleaning and disinfecting
A coil block should be kept clean to guarantee it works well. The user of the heat exchanger should
ensure that the cleaning and disinfecting agents that are used do not have a corrosive effect on the
materials used by Alfa LU-VE.
7.4 Casing
Casework checks should be carried out at least every 3 months. In doing so, inspect for any
deterioration of coating and/or corrosion. If such flaws are noted, take immediately remedial action.
Should any damage occur during installation, this should be repaired immediately to prevent further
deterioration.
7.5 Coil and driptray
The heat exchanger coil should be checked at least every 3 months, with close inspection being
carried out for such things as leaks or chafing of tubes. In addition, any unusual vibration of the
fans should be checked. The unit should be cleaned as instructed when necessary using low
pressure compressed air, and/or low pressure water hose or a mild detergent wash. Care must
be taken not to hose directly onto fan motors or electric control panels or the electrical connection
boxes of the heaters. It should be noted that abnormal atmospheric conditions can greatly harm the
lifetime of the finned coil.
Please ensure the drip tray is empty before it is disassembled. The weight of any leftover water
could injure the operator if the drip tray fell open accidentally.

31573808EN-02
19
Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
7.6 Electric defrost elements replacement
Before handling heater elements always:
• disconnect power supply
• ensure heaters are at ambient temperature.
1
2
HD
E
4
3
1-2
5 (U)
6
E
U
V
To remove electric defrost elements (E), open
the driptray and side covers on both sides.
Disconnect heater element from connection box.
On the opposite cooler side, remove fixing clip
(U) and extract element from coil.
337
8
10
10
9 (U)
(U)
3
12 12
11
new
new
Mount new element in reverse order and
reassamble the fixing clip in the correct position
(V).
Restore electrical connections and close side
covers and driptray.

31573808EN-02
20
Alfa LU-VE is a trademark registered and owned by LU-VE Group.
Alfa LU-VE reserves the right to change specifications without prior notification.
7.7 Driptray heater elements replacement
Before handling heater elements always:
• disconnect power supply
• ensure heaters are at ambient temperature.
To remove driptray heater elements (HD), open
the driptray.
Z
HD
1
2
HD
E
Disconnect heater element and remove element
from bottom plate while gently bending the fixing
clips (Z).
Mount new element in reverse order.
Close driptray and restore electrical connections.